# CVE-2026-101042: Parse Server unverified provider identity acceptance on login

Source: https://junglewise.ai/threats/cve-2026-101042-parse-server-is-an-open-source-backend-server-in-versions-9-0-0  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-27. Updated: 2026-09-27  
License: CC BY 4.0 with a link back

CVE-2026-101042 · Severity: medium · CVSS 6.4 · Published 2026-09-27

Parse Server, an open-source backend platform, fails to verify external provider credentials (GitHub, Google, Instagram, and others) during password-based login, allowing authenticated users to claim fake identities from these providers. An attacker can impersonate legitimate users or hijack accounts by claiming a provider identity before the legitimate owner links it. This affects deployments using any of the ten code-based authentication adapters.

Technologies: [Parse Community Parse Server](https://junglewise.ai/threats/technologies/parse-community-parse-server). Vendors: [Parse Community](https://junglewise.ai/threats/vendors/parse-community).

## Quick answers

**Is CVE-2026-101042 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-101042 being exploited in the wild.

**How severe is CVE-2026-101042?** Medium severity, with a CVSS score of 6.4, published 27 September 2026.

**Which products and versions are affected?** Parse Community Parse Server >=9.0.0 <9.10.1-alpha.10 and >=8.0.2 <8.6.91.

**Is there a fix for CVE-2026-101042?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-101042 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-101042?** Check whether you run Parse Community Parse Server at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability exists in Parse Server's code-based authentication adapters, which verify provider credentials during signup and account linking but skip verification during login when auth data is combined with username/password. An authenticated attacker can exploit this by submitting an unverified provider identity on the login endpoint; a network attacker can pre-hijack accounts by claiming provider IDs of future users. The fix involves running credential verification on login/challenge endpoints and preventing duplicate provider identity linkage across accounts.

## Affected products

- Parse Community Parse Server >=9.0.0 <9.10.1-alpha.10 and >=8.0.2 <8.6.91

## Timeline

- 2026-09-27: disclosed: Security advisory published

## References

- [https://github.com/parse-community/parse-server/security/advisories/GHSA-mr43-w6c2-mvjq](https://github.com/parse-community/parse-server/security/advisories/GHSA-mr43-w6c2-mvjq)
- [https://www.vulncheck.com/advisories/parse-server-9.0.0-authentication-bypass-via-unverified-provider-identity](https://www.vulncheck.com/advisories/parse-server-9.0.0-authentication-bypass-via-unverified-provider-identity)

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